Merge master.kernel.org:/home/rmk/linux-2.6-arm

[linux-2.6] / kernel / kprobes.c

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 65242529a75f1355e890fd92cda79b6a9d30ce81..b0237122b24e14667631716a8a6c3e23a495a7e9 100644 (file)
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -240,12 +240,6 @@ static int aggr_break_handler(struct kprobe *p, struct pt_regs *regs)
        return 0;
 }
 
-struct kprobe trampoline_p = {
-               .addr = (kprobe_opcode_t *) &kretprobe_trampoline,
-               .pre_handler = trampoline_probe_handler,
-               .post_handler = trampoline_post_handler
-};
-
 struct kretprobe_instance *get_free_rp_inst(struct kretprobe *rp)
 {
        struct hlist_node *node;
@@ -264,35 +258,18 @@ static struct kretprobe_instance *get_used_rp_inst(struct kretprobe *rp)
        return NULL;
 }
 
-struct kretprobe_instance *get_rp_inst(void *sara)
-{
-       struct hlist_head *head;
-       struct hlist_node *node;
-       struct task_struct *tsk;
-       struct kretprobe_instance *ri;
-
-       tsk = arch_get_kprobe_task(sara);
-       head = &kretprobe_inst_table[hash_ptr(tsk, KPROBE_HASH_BITS)];
-       hlist_for_each_entry(ri, node, head, hlist) {
-               if (ri->stack_addr == sara)
-                       return ri;
-       }
-       return NULL;
-}
-
 void add_rp_inst(struct kretprobe_instance *ri)
 {
-       struct task_struct *tsk;
        /*
         * Remove rp inst off the free list -
         * Add it back when probed function returns
         */
        hlist_del(&ri->uflist);
-       tsk = arch_get_kprobe_task(ri->stack_addr);
+
        /* Add rp inst onto table */
        INIT_HLIST_NODE(&ri->hlist);
        hlist_add_head(&ri->hlist,
-                       &kretprobe_inst_table[hash_ptr(tsk, KPROBE_HASH_BITS)]);
+                       &kretprobe_inst_table[hash_ptr(ri->task, KPROBE_HASH_BITS)]);
 
        /* Also add this rp inst to the used list. */
        INIT_HLIST_NODE(&ri->uflist);
@@ -319,34 +296,25 @@ struct hlist_head * kretprobe_inst_table_head(struct task_struct *tsk)
        return &kretprobe_inst_table[hash_ptr(tsk, KPROBE_HASH_BITS)];
 }
 
-struct kretprobe_instance *get_rp_inst_tsk(struct task_struct *tk)
-{
-       struct task_struct *tsk;
-       struct hlist_head *head;
-       struct hlist_node *node;
-       struct kretprobe_instance *ri;
-
-       head = &kretprobe_inst_table[hash_ptr(tk, KPROBE_HASH_BITS)];
-
-       hlist_for_each_entry(ri, node, head, hlist) {
-               tsk = arch_get_kprobe_task(ri->stack_addr);
-               if (tsk == tk)
-                       return ri;
-       }
-       return NULL;
-}
-
 /*
- * This function is called from do_exit or do_execv when task tk's stack is
- * about to be recycled. Recycle any function-return probe instances
- * associated with this task. These represent probed functions that have
- * been called but may never return.
+ * This function is called from exit_thread or flush_thread when task tk's
+ * stack is being recycled so that we can recycle any function-return probe
+ * instances associated with this task. These left over instances represent
+ * probed functions that have been called but will never return.
  */
 void kprobe_flush_task(struct task_struct *tk)
 {
+        struct kretprobe_instance *ri;
+        struct hlist_head *head;
+       struct hlist_node *node, *tmp;
        unsigned long flags = 0;
+
        spin_lock_irqsave(&kprobe_lock, flags);
-       arch_kprobe_flush_task(tk);
+        head = kretprobe_inst_table_head(current);
+        hlist_for_each_entry_safe(ri, node, tmp, head, hlist) {
+                if (ri->task == tk)
+                        recycle_rp_inst(ri);
+        }
        spin_unlock_irqrestore(&kprobe_lock, flags);
 }
 
@@ -606,9 +574,10 @@ static int __init init_kprobes(void)
                INIT_HLIST_HEAD(&kretprobe_inst_table[i]);
        }
 
-       err = register_die_notifier(&kprobe_exceptions_nb);
-       /* Register the trampoline probe for return probe */
-       register_kprobe(&trampoline_p);
+       err = arch_init_kprobes();
+       if (!err)
+               err = register_die_notifier(&kprobe_exceptions_nb);
+
        return err;
 }